Multiple choice

A train crosses the platforms of two consecutive stations. The length of the first platform is 430 m and the length of the second platform is 550 m. The train crosses them in 30 seconds and 36 seconds, respectively. What is the speed of the train?

  1. 72 kmph

  2. 36 kmph

  3. 20 kmph

  4. 40 kmph
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A Correct answer
Explanation

Speed = (Length1 + TrainLength) / 30 = (Length2 + TrainLength) / 36. (430 + L) / 30 = (550 + L) / 36. 36(430 + L) = 30(550 + L). 6(430 + L) = 5(550 + L). 2580 + 6L = 2750 + 5L. L = 170. Speed = (430 + 170) / 30 = 600 / 30 = 20 m/s. 20 m/s * 18/5 = 72 kmph.

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